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Black Mountain Pass

A4069 · Llangadog → Brynamman · Wales

Length
10 miles
Drive time
20–30 min
Type
Mountain pass
Region
Wales

The road Top Gear made famous. Sweeping hairpins climb over the western Brecon Beacons between Llangadog and Brynamman, with huge moorland views and a quarry-carved summit section.

From Llangadog the A4069 is a normal A-road until the first hairpins start stacking toward the Black Mountain. The famous sequence is the quarry-carved climb on the Brynamman side: open, well-sighted switchbacks with a wide enough carriageway that two cars pass without drama, then a summit section cut through old workings. Surface is generally good Welsh A-road tarmac. The hazards are the ones the short description underplays — sheep on the moor, sudden low cloud, and a summit car park that dumps walkers onto the road. It is not single-track. Gradients are steep but not Hardknott-steep; a competent driver in an ordinary car is fine.

Top Gear used this road so often that weekend mid-mornings still draw the same traffic the footage created. Go at eight, or on a weekday. Herbert's Quarry viewpoint is the stop: a rough car park on the west side of the summit with the whole Tywi valley behind you. That is the photograph. Do not park on the hairpins themselves. Fuel and food are in Llandovery or Llangadog before you start; there is nothing useful on the moor.

Pair it with Gospel Pass the same day if you want the contrast — A-road then true mountain lane — or drop south toward the Valleys and Rhigos. The Beacons are full of similar-looking yellow roads; this one is the one with the quarry wall and the television history.

Drive it for the sightlines and the space, not as a test. The road is policed like any other A-road in Wales, and the sheep do not check your approach speed.

Highlights of the Black Mountain Pass

Where to stop on the Black Mountain Pass

Drive the Black Mountain Pass

Open Black Mountain Pass on the map → ⬇ Download GPX

GPX works with Garmin, TomTom, Beeline and most bike sat-navs. Free, no sign-up — these are indicative waypoints, so follow the road signs, not the arrow.

Plot it, add it to a club run with a meeting point and pit stops, then share the whole trip as one link. Free, no account, works offline.

Route research: Venture Bound

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